No, Jon Bois did not make these shirts. These are real, official shirts! Like, not even on CafePress! I am hoping that at some point, they release a shirt that is just like the "CHAMPION" one, but over his silhouette it says "QUARTERBACK," or maybe "PARTICIPANT."
Please also note that the "JOE FLACCO" on the "JOE FLACCO FOOTBALL" shirt has a trademark.